What's he talking about exactly from a technical standpoint?
We will need to wait for him to write up a blog summary, but my interpretation is that it is a method of propagating through the network "abbreviated" blocks which will always be the same size no matter how much Bitcoin tx volume occurs (within reason!). The full blocks would follow separately to those nodes which want them, perhaps to be known as "archive" nodes. It means that mining can happen fast on the next block without waiting for the slow propagation and verification of larger and larger blocks. It is a more sophisticated extension of the headers-first proposals.
Fantastic if it can be done. To the moon and all that...
It would also mean that the current incentive to keep block sizes small due to increased orphaning probability would be removed ... and the block size limit debate is back on the table with more urgency.
